diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-3.9/043-MIPS-BCM63XX-Add-SMP-support-to-prom.c.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-3.9/043-MIPS-BCM63XX-Add-SMP-support-to-prom.c.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.9/043-MIPS-BCM63XX-Add-SMP-support-to-prom.c.patch b/target/linux/brcm63xx/patches-3.9/043-MIPS-BCM63XX-Add-SMP-support-to-prom.c.patch new file mode 100644 index 0000000000..23f6d852c8 --- /dev/null +++ b/target/linux/brcm63xx/patches-3.9/043-MIPS-BCM63XX-Add-SMP-support-to-prom.c.patch @@ -0,0 +1,82 @@ +From 7c44eabf20cba12049bf9eebfa192afcc2053b2d Mon Sep 17 00:00:00 2001 +From: Kevin Cernekee <cernekee@gmail.com> +Date: Sat, 9 Jul 2011 12:15:06 -0700 +Subject: [PATCH V2 1/2] MIPS: BCM63XX: Add SMP support to prom.c + +This involves two changes to the BSP code: + +1) register_smp_ops() for BMIPS SMP + +2) The CPU1 boot vector on some of the BCM63xx platforms conflicts with +the special interrupt vector (IV). Move it to 0x8000_0380 at boot time, +to resolve the conflict. + +Signed-off-by: Kevin Cernekee <cernekee@gmail.com> +[jogo@openwrt.org: moved SMP ops registration into ifdef guard, + changed ifdef guards to if (IS_ENABLED())] +Signed-off-by: Jonas Gorski <jogo@openwrt.org> +--- +V1 -> V2: + * changed ifdef guards to if (IS_ENABLED()) + + arch/mips/bcm63xx/prom.c | 41 +++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 41 insertions(+) + +--- a/arch/mips/bcm63xx/prom.c ++++ b/arch/mips/bcm63xx/prom.c +@@ -8,7 +8,11 @@ + + #include <linux/init.h> + #include <linux/bootmem.h> ++#include <linux/smp.h> + #include <asm/bootinfo.h> ++#include <asm/bmips.h> ++#include <asm/smp-ops.h> ++#include <asm/mipsregs.h> + #include <bcm63xx_board.h> + #include <bcm63xx_cpu.h> + #include <bcm63xx_io.h> +@@ -54,6 +58,43 @@ void __init prom_init(void) + + /* do low level board init */ + board_prom_init(); ++ ++ if (IS_ENABLED(CONFIG_CPU_BMIPS4350) && IS_ENABLED(CONFIG_SMP)) { ++ /* set up SMP */ ++ register_smp_ops(&bmips_smp_ops); ++ ++ /* ++ * BCM6328 might not have its second CPU enabled, while BCM6358 ++ * needs special handling for its shared TLB, so disable SMP ++ * for now. ++ */ ++ if (BCMCPU_IS_6328()) { ++ bmips_smp_enabled = 0; ++ } else if (BCMCPU_IS_6358()) { ++ bmips_smp_enabled = 0; ++ } ++ ++ if (!bmips_smp_enabled) ++ return; ++ ++ /* ++ * The bootloader has set up the CPU1 reset vector at ++ * 0xa000_0200. ++ * This conflicts with the special interrupt vector (IV). ++ * The bootloader has also set up CPU1 to respond to the wrong ++ * IPI interrupt. ++ * Here we will start up CPU1 in the background and ask it to ++ * reconfigure itself then go back to sleep. ++ */ ++ memcpy((void *)0xa0000200, &bmips_smp_movevec, 0x20); ++ __sync(); ++ set_c0_cause(C_SW0); ++ cpumask_set_cpu(1, &bmips_booted_mask); ++ ++ /* ++ * FIXME: we really should have some sort of hazard barrier here ++ */ ++ } + } + + void __init prom_free_prom_memory(void) |